Prysm Client Incident Causes Major Block and Attestation Loss on Ethereum Mainnet

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Release Time:12/14/2025 03:46:14

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The Prysm project team released a post-mortem report on a mainnet incident that occurred on December 4 during the Fusaka epoch. Nearly all Prysm beacon nodes faced resource exhaustion while processing specific attestations, causing block and attestation losses. The issue spanned 42 epochs, with 248 slots missing and participation dropping to 75%. Validators lost around 382 ETH in rewards. The root cause was faulty attestations referencing old block roots, triggering high-cost state transitions. An interim fix was deployed in v7.0.0, with v7.0.1 and v7.1.0 offering long-term solutions. The mainnet recovered to over 95% participation by epoch 411480. The project team highlighted the risks of client concentration and pledged to improve testing and configuration.

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